SB2018010203 - Multiple vulnerabilities in NetBSD
Published: January 2, 2018
Security Bulletin ID
SB2018010203
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
3
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Privilege escalation (CVE-ID: N/A)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a missing mask in a syscall in in sys/arch/sparc64/sparc64/compat_13_machdep.c on sparc64 architecture. A local unprivileged user can set privileged bits, such as PSTATE_PRIV in the %pstate register and gain escalated privileges on the system.
2) Privilege escalation (CVE-ID: N/A)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to an error in compat_linux32 when handling GDT on amd64 system in sys/compat/linux32/arch/amd64/linux32_machdep.c. A local unprivileged user can create a condition where a page fault is generated if a segment register is reloaded with a "high" selector, located near the end of the GDT, and gain root access to the system.
3) Improper input validation (CVE-ID: N/A)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an input validation error in sys/arch/i386/i386/i386_trap.S (for NetBSD 7.x) or sys/arch/i386/i386/vector.S (for NetBSD 6.x) when the #UD exception handler is implicitly using the %ds register, before it actually initialized it to the kernel value. A local unprivileged user can crash the system.
Remediation
Install update from vendor's website.